public class SecondPassGroupingCollector<T> extends SimpleCollector
GroupReducer
to each groupTopGroupsCollector
,
DistinctValuesCollector
Modifier and Type | Field and Description |
---|---|
protected GroupReducer<T,?> |
groupReducer |
protected java.util.Collection<SearchGroup<T>> |
groups |
protected GroupSelector<T> |
groupSelector |
protected int |
totalGroupedHitCount |
protected int |
totalHitCount |
Constructor and Description |
---|
SecondPassGroupingCollector(GroupSelector<T> groupSelector,
java.util.Collection<SearchGroup<T>> groups,
GroupReducer<T,?> reducer)
Create a new SecondPassGroupingCollector
|
Modifier and Type | Method and Description |
---|---|
void |
collect(int doc)
Called once for every document matching a query, with the unbased document
number.
|
protected void |
doSetNextReader(LeafReaderContext readerContext)
This method is called before collecting
context . |
GroupSelector<T> |
getGroupSelector() |
boolean |
needsScores()
Indicates if document scores are needed by this collector.
|
void |
setScorer(Scorer scorer)
Called before successive calls to
LeafCollector.collect(int) . |
getLeafCollector
protected final GroupSelector<T> groupSelector
protected final java.util.Collection<SearchGroup<T>> groups
protected final GroupReducer<T,?> groupReducer
protected int totalHitCount
protected int totalGroupedHitCount
public SecondPassGroupingCollector(GroupSelector<T> groupSelector, java.util.Collection<SearchGroup<T>> groups, GroupReducer<T,?> reducer)
groupSelector
- the GroupSelector that defines groups for this searchgroups
- the groups to collect documents forreducer
- the reducer to apply to each grouppublic GroupSelector<T> getGroupSelector()
public boolean needsScores()
Collector
true
if scores are needed.public void setScorer(Scorer scorer) throws java.io.IOException
LeafCollector
LeafCollector.collect(int)
. Implementations
that need the score of the current document (passed-in to
LeafCollector.collect(int)
), should save the passed-in Scorer and call
scorer.score() when needed.setScorer
in interface LeafCollector
setScorer
in class SimpleCollector
java.io.IOException
public void collect(int doc) throws java.io.IOException
LeafCollector
Note: The collection of the current segment can be terminated by throwing
a CollectionTerminatedException
. In this case, the last docs of the
current LeafReaderContext
will be skipped and IndexSearcher
will swallow the exception and continue collection with the next leaf.
Note: This is called in an inner search loop. For good search performance,
implementations of this method should not call IndexSearcher.doc(int)
or
IndexReader.document(int)
on every hit.
Doing so can slow searches by an order of magnitude or more.
collect
in interface LeafCollector
collect
in class SimpleCollector
java.io.IOException
protected void doSetNextReader(LeafReaderContext readerContext) throws java.io.IOException
SimpleCollector
context
.doSetNextReader
in class SimpleCollector
java.io.IOException
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